<template>
<div>
  <!-- 面包屑导航 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>添加商品</el-breadcrumb-item>
  </el-breadcrumb>
  <!-- 卡片视图区域 -->
  <el-card>
     <!-- 头部提醒 -->
     <el-alert
     title="添加商品信息"
     type="info"
     center
     show-icon
     :closable="false" />
     <!-- 步骤条区域 -->
     <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
     </el-steps>
     <!-- tab栏区域 -->
     <el-form
     :model="addForm"
     :rules="addFormRules"
     ref="addFormRef"
     label-width="100px"
     label-position="top">
      <el-tabs
      :tab-position="'left'"
      v-model="activeIndex"
      :before-leave="beforeTabeLeave"
      @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name='0'>
         <el-form-item label="商品名称:" prop="goods_name">
           <el-input v-model="addForm.goods_name"></el-input>
         </el-form-item>
         <el-form-item label="商品价格:" prop="goods_price">
           <el-input v-model="addForm.goods_price" type="number" ></el-input>
         </el-form-item>
         <el-form-item label="商品重量:" prop="goods_weight">
           <el-input v-model="addForm.goods_weight" type="number"></el-input>
         </el-form-item>
         <el-form-item label="商品数量:" prop="goods_number">
           <el-input v-model="addForm.goods_number" type="number"></el-input>
         </el-form-item>
         <el-form-item label="商品分类:" prop="goods_cat">
           <el-cascader
           v-model="addForm.goods_cat"
           :options="catelist"
           :props="cateprops"
           @change="handleChange">
         </el-cascader>
         </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name='1'>
        <el-form-item
         v-for="item in manyTableData"
         :key="item.attr_id"
         :label="item.attr_name">
          <!-- 复选框组 -->
          <el-checkbox-group v-model="item.attr_vals">
            <el-checkbox
            v-for="(cb, index) in item.attr_vals"
            :label="cb"
            :key="index"
            border></el-checkbox>
          </el-checkbox-group>
        </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name='2'>
         <el-form-item
         v-for="item in onlyTableData"
         :key="item.attr_id"
         :label="item.attr_name">
         <el-input v-model="item.attr_vals">
         </el-input>
         </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name='3'>
         <el-upload
           :action="uploadUrl"
           :on-preview="handlePreview"
           :on-remove="handleRemove"
           :on-success="handleSuccess"
           list-type="picture"
           :headers="headerObj">
           <el-button size="small" type="primary">点击上传</el-button>
           <div slot="tip" class="el-upload__tip">
             只能上传jpg/png文件，且不超过500kb
           </div>
         </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name='4'>
         <!-- 富文本编辑器 -->
         <quill-editor v-model="addForm.goods_introduce" />
         <!-- 添加商品按钮 -->
         <el-button type='primary' class="addBtn" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
     </el-form>
  </el-card>
  <!-- 图片预览对话框 -->
  <el-dialog
  title="图片预览"
  :visible.sync="previewDialogVisible"
  width="50%">
  <img :src="previewPath" class="preview-img"/>
</el-dialog>
</div>
</template>

<script>
export default {
  name: 'add',
  data() {
    return {
      // 步骤条当前激活项
      activeIndex: '0',
      // 添加商品表单
      addForm: {
        goods_name: '',
        // 价格
        goods_price: 0,
        // 商品重量
        goods_weight: 0,
        // 商品数量
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 上传图片数组
        pics: [],
        // 上传商品详情内容
        goods_introduce: '',
        // 参数数组
        attrs: []
      },
      // 添加表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ],
      },
      // 商品分类列表
      catelist: [],
      // 级联选择器的配置
      cateprops: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 上传url地址
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传请求头 需要手动指定
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览的Url
      previewPath: '',
      // 图片预览对话框的显示
      previewDialogVisible: false
    }
  },
  computed: {
    // 商品分类的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) return this.addForm.goods_cat[2]
      return null
    }
  },
  methods: {
    // 获取所有商品分类
    getCateList() {
      this.$http.get('categories').then(res => {
        let result = res.data
        if (result.meta.status !== 200) return this.$message.error('获取列表失败')
        this.catelist = result.data
      })
    },
    // 级联选择器变化
    handleChange() {
      console.log(this.addForm.goods_cat.length);
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
    },
    // tab栏离开的钩子函数
    beforeTabeLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('商品分类未选择')
        // 返回值是false就不会触发tab栏的切换
        return false
      }
    },
    // tab标签页点击
    tabClicked() {
      if (this.activeIndex === '1') {
        // 访问的商品参数面板
        this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: 'many' }})
          .then(res => {
            let result = res.data
            if (result.meta.status !== 200) return this.$message.error('参数获取失败')
            result.data.forEach(item => {
              item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manyTableData = result.data
            console.log(this.manyTableData)
          })
      }
      if (this.activeIndex === '2') {
        // 访问商品属性面板
        this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: 'only' }})
          .then(res => {
            let result = res.data
            if (result.meta.status !== 200) return this.$message.error('参数属性失败')
            this.onlyTableData = result.data
          })
      }
    },
    // 图片预览函数
    handlePreview(file) {
      console.log(file);
      // 保存file的url
      this.previewPath = file.response.data.url
      // 显示图片预览对话框
      this.previewDialogVisible = true
    },
    // 移除图片操作
    handleRemove(file) {
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 在pics数组中找到这个图片的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 通过splice方法，删除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm.pics)
    },
    // 文件上传成功事件监听
    handleSuccess(response) {
      // 拼接出对象
      const picInfo = { pic: response.data.tmp_path }
      // push进数组
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    // 点击添加商品
    add() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) return this.$message.error('请检查表单')
        // 将数组转换成字符串
        // 使用ES6来进行深拷贝
        const form = JSON.parse(JSON.stringify(this.addForm))
        form.goods_cat = form.goods_cat.join(',')
        // 转换参数数组
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求 添加商品 商品名称必须是唯一的
        this.$http.post('goods', form)
          .then(res => {
            let result = res.data
            console.log(result);
            if (result.meta.status !== 201) return this.$message.error('添加失败')
            this.$message.success('添加成功')
            this.$router.push('/goods')
          })

      })
    }
  },
  created() {
    this.getCateList()
  },
}
</script>

<style lang='stylus' scoped>
.el-checkbox
  margin 0 10px 0 0!important
.preview-img
  width 100%
.addBtn
  margin-top 15px
</style>